diff --git a/Earthfile b/Earthfile
index 4cb5cd72..211c47c8 100644
--- a/Earthfile
+++ b/Earthfile
@@ -28,7 +28,7 @@ WORKDIR /veilid
 # Install build prerequisites & setup required directories
 deps-base:
     RUN apt-get -y update
-    RUN apt-get install -y iproute2 curl build-essential cmake libssl-dev openssl file git pkg-config libdbus-1-dev libdbus-glib-1-dev libgirepository1.0-dev libcairo2-dev checkinstall unzip libncursesw5-dev libncurses5-dev
+    RUN apt-get install -y iproute2 curl build-essential cmake libssl-dev openssl file git pkg-config libdbus-1-dev libdbus-glib-1-dev libgirepository1.0-dev libcairo2-dev checkinstall unzip libncursesw5-dev libncurses5-dev capnp
 
 # Install Rust
 deps-rust: